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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a50479f8e9e08b61b09454ef33f6a0c3f5a832c984fef7c6c83d61da71a3fb7' 
  AND token = 'Uv6ulaLmPRKUX2zfUSektxLIM95tFVU1BfFr7O1gMXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}